Indians vs. Trappers, Cowboys Settlers
MLA
Erdoes, Richard, 1912-2008. Indians vs. Trappers, Cowboys Settlers. Box 45 | Plains Indian History I. 1976-1983, undated. https://collections.library.yale.edu/catalog/10256148.
APA, 6th edition
Erdoes, Richard, 1912-2008. (["Box 45 | Plains Indian History I"])(1976-1983, undated)[Indians vs. Trappers, Cowboys Settlers]. https://collections.library.yale.edu/catalog/10256148.